I want to perform a two-groups design using Error1 and Error2. I'm not sure if Error1 can serve as the independent variable and Error2 the dependent variable. I want to see if there is a difference between the number of identification of errors before or after completing the annual OSHA training.

VARIABLE NAMES AND DESCRIPTIONS GENDER 0 = male; 1 = female EVENTS number of stressful life events that had occurred in the last year SATISFACTION average Likert-based (1-5) response to survey assessing workplace satisfaction (higher indicates higher satisfaction) ERROR1 this number represents the identification of OSHA hazards before completing the annual OSHA training (higher # = identification of more errors) ERROR2 this number represents the identification of OSHA hazards after completing the annual OSHA training (higher # = identification of more errors) EMPLOYEE employee type (1 = sales; 2 = warehouse; 3 = management) SKILLS1 skills assessment taken within the first week on the job (higher = better skills) SKILLS2 skills assessment completed after 6 months on the job (higher = better skills) SKILLS3 skills assessment completed after 1 year of service (higher = better skills) SALARY1 salary at the time of hire SALARY2 current salary YEARS number of years employed PERSONALITY Personality type (1 = Type "A" or 2 = Type "B")